Temperature dependent electronic quenching of OH(A 2Σ+, v′=0) between 230 and 310 K

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Abstract
Measurements were made of the temperature dependence of the rate constant for collisional quenching of the v’=0 level of the A 2Σ+ electronically excited state of the OH radical. For all quenchers examined (CO2, H2, O2, and N2), we observed that the thermally averaged cross section σQ increased as the temperature is decreased. For N2, the slowest quencher, σQ shows a dramatic increase from 4.0±0.7 Å2 at 311±10 K to 7.0±0.6 Å2 at 232±5 K. The results of this work and other high temperature (900–1300 K) studies from this laboratory are compared with a description of the collisional encounter involving attractive forces and complex formation.